...Michel Gho; Barry Ganetzky ABSTRACT In Drosophila melanogaster muscles and neuronal cell bodies at least four different potassium currents have been identified whose activity shapes the electrical properties of these cells. Potassium currents also control repolarization of presynaptic terminals...

... contractile and produced action potentials when depolarized. These action potentials are formed by a complex array of ionic currents consisting of at least one, and possibly two, inward calcium currents and four outward potassium currents. The ionic selectivity of the calcium currents was Ca 2+ >Sr 2...

...±3MΩ. The space constant of the fibres was 2.03±0.33mm ( N =5). Three outward potassium currents were resolved in response to a depolarising step to zero from resting potential. (1) An early transient current, voltage-activated and blocked by 2 mmol I −1 4-aminopyridine (4-AP). This resembled...